<template>
  <div>
    <!-- 面包屑 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>添加商品</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图 -->
    <el-card>
      <el-alert
        title="添加商品信息"
        type="info"
        center
        show-icon
        :closable="false"
      >
      </el-alert>
      <!-- 步骤条区域 -->
      <el-steps
        :space="200"
        :active="activeIndex - 0"
        finish-status="success"
        align-center
      >
        <el-step title="基本信息"></el-step>
        <el-step title="商品参数"></el-step>
        <el-step title="商品属性"></el-step>
        <el-step title="商品图片"></el-step>
        <el-step title="商品内容"></el-step>
        <el-step title="完成"></el-step>
      </el-steps>

      <!-- tab栏 -->
      <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px" label-position="top">
        <el-tabs v-model="activeIndex" :tab-position="'left'" :before-leave="beforeTabLeave" @tab-click="tabClicked">
            <el-tab-pane label="基本信息" name:="0">
                <el-form-item label="商品名称" prop="goods_name">
                    <el-input v-model="addForm.goods_name"></el-input>
                </el-form-item>
                <el-form-item label="商品价格" prop="goods_price">
                    <el-input v-model="addForm.goods_price" type="number"></el-input>
                </el-form-item>
                <el-form-item label="商品重量" prop="goods_weight">
                    <el-input v-model="addForm.goods_weight" type="number"></el-input>
                </el-form-item>
                <el-form-item label="商品数量" prop="goods_number">
                    <el-input v-model="addForm.goods_number" type="number"></el-input>
                </el-form-item>
                <el-form-item label="商品分类" prop="goods_cat">
                    <el-cascader
                    v-model="addForm.goods_cat"
                    :options="cateList"
                    :props="{ expandTrigger: 'hover',...cateProps }"
                    @change="handleChange">
                    </el-cascader>  
                </el-form-item>
                
            </el-tab-pane>
            <el-tab-pane label="商品参数" name:="1">
              <el-form-item :label="item.attr_name" v-for="item in manyTableData" :key="item.attr_id">
                <el-checkbox-group v-model="item.attr_vals">
                  <el-checkbox :label="cb" v-for="(cb,i) in item.attr_vals" :key="i" :border="true"></el-checkbox>
                </el-checkbox-group>

              </el-form-item>
            </el-tab-pane>
            <el-tab-pane label="商品属性" name:="2">
              <el-form-item :label="item.attr_name" v-for="item in onlyTableData" :key="item.attr_id">
                <el-input v-model="item.attr_vals"></el-input>
              </el-form-item>
            </el-tab-pane>
            <el-tab-pane label="商品图片" name:="3">
              <!-- action 表示图片要上传到的后台api地址 -->
              <el-upload
                :action="upLoadURL"
                :on-preview="handlePreview"
                :on-remove="handleRemove"
                list-type="picture"
                :headers="headerObj"
                :on-success="handleSuccess"
                >
                <el-button size="small" type="primary">点击上传</el-button>
              </el-upload>
            </el-tab-pane>
            <el-tab-pane label="商品内容" name:="4">
              <quill-editor v-model="addForm.goods_introduce"></quill-editor>
              <!-- 添加商品的按钮 -->
              <el-button type="primary" class="addBtn" @click="add">添加商品</el-button>
            </el-tab-pane>
        </el-tabs>
      </el-form>
    </el-card>

    <!-- 图片预览 -->
      <el-dialog
        title="图片预览"
        :visible.sync="previewDialogVisible"
        width="50%"
        >
        <img :src="previewPath" alt="" class="previewImg">
      </el-dialog>
  </div>
</template>

<script>
  import _ from 'lodash'
export default {
  name: "Add",
  data() {
    return {
      activeIndex: "0",
      //添加商品的表单数据对象
      addForm: {
        goods_name: "",
        goods_price: 0,
        goods_weight: 0,
        goods_number: 0,
        //商品所属的分类数组
        goods_cat: [],
        //图片的数组
        pics: [],
        //商品的详情描述
        goods_introduce:'',
        attrs:[]
      },
      //添加商品的表单的验证规则
      addFormRules: {
        goods_name: [
          {
            required: true,
            message: "请输入商品名称",
            trigger: "blur",
          },
        ],
        goods_price: [
          {
            required: true,
            message: "请输入商品价格",
            trigger: "blur",
          },
        ],
        goods_weight: [
          {
            required: true,
            message: "请输入商品重量",
            trigger: "blur",
          },
        ],
        goods_number: [
          {
            required: true,
            message: "请输入商品数量",
            trigger: "blur",
          },
        ],
        goods_cat: [
          {
            required: true,
            message: "请选择商品分类",
            trigger: "blur",
          },
        ],
      },
      //商品分类列表
      cateList: [],
      cateProps: {
        label: "cat_name",
        value: "cat_id",
        children: "children",
      },
      //动态参数列表
      manyTableData: [],
      //静态属性列表
      onlyTableData: [],
      //上传图片的URL地址
      upLoadURL: "https://lianghj.top:8888/api/private/v1/upload",
      //图片上传组件的headers请求头对象
      headerObj: {
        Authorization: window.sessionStorage.getItem("token"),
      },
      //
      previewPath: '',
      //控制图片预览对话框的显示与隐藏
      previewDialogVisible: false,
    };
  },
  created() {
    this.getCateList();
  },
  methods: {
    //获取商品分类列表
    async getCateList() {
      const { data: res } = await this.$http.get("categories");
      if (res.meta.status !== 200) {
        return this.$message.error("获取商品分类列表数据失败!");
      } else {
        this.cateList = res.data;
      }
    },
    //级联选择器选中项变化，会触发这个函数
    handleChange() {
      if (this.addForm.goods_cat.length !== 3) {
        this.addForm.goods_cat = [];
      }
    },
    //控制Tab标签切换
    beforeTabLeave(activeName, oldActiveName) {
      // console.log('即将离开:' + oldActiveName);
      // console.log('即将进入:' + activeName);
      // return false
      if (oldActiveName === "0" && this.addForm.goods_cat.length !== 3) {
        this.$message.error("请先选择商品分类");
        return false;
      }
    },
    //
    async tabClicked() {
      if (this.activeIndex === "1") {
        const { data: res } = await this.$http.get(
          `categories/${this.cateId}/attributes`,
          { params: { sel: "many" } }
        );
        if (res.meta.status !== 200) {
          return this.$message.error("获取分类参数失败!");
        } else {
          res.data.forEach((item) => {
            item.attr_vals =
              item.attr_vals.length === 0 ? [] : item.attr_vals.split(",");
          });
          this.manyTableData = res.data;
          console.log(this.manyTableData);
        }
      } else if (this.activeIndex === "2") {
        const { data: res } = await this.$http.get(
          `categories/${this.cateId}/attributes`,
          { params: { sel: "only" } }
        );
        if (res.meta.status !== 200) {
          return this.$message.error("获取静态属性数据失败!");
        } else {
          console.log(res.data);
          this.onlyTableData = res.data;
        }
      }
    },
    //处理图片预览效果
    handlePreview(file) {
      const u = 'https://lianghj.top:8888/'
      this.previewPath = u + file.response.data.tmp_path;
      this.previewDialogVisible = true;
    },
    //处理图片删除操作
    handleRemove(file) {
      console.log(file);
      //1.获取将要删除的图片的临时路径
      const filePath = file.response.data.tmp_path;
      //2.从pics数组中，找到这个图片的对应索引值
      const i = this.addForm.pics.findIndex((x) => x.pic === filePath);
      //3.调用数组的splice方法，把图片信息对象，从数组中移除
      this.addForm.pics.splice(i, 1);
      console.log(this.addForm);
    },
    //监听图片上传成功的事件
    handleSuccess(response) {
      console.log(response);
      //1.拼接得到一个图片信息对象
      const picInfo = { pic: response.data.tmp_path };
      //2.将图片信息对象，push到pics数组中
      this.addForm.pics.push(picInfo);
      console.log(this.addForm);
    },
    //添加商品
    add() {
      this.$refs.addFormRef.validate(async valid => {
        if(!valid) {
          return this.$message.error('请填写必要的表单项!');
        } else {
          //执行添加的业务逻辑
          //JS实现深拷贝 const newAddForm = JSON.parse(JSON.stringify(addForm))

          //lodash  cloneDeep(obj)
          const form = _.cloneDeep(this.addForm);
          form.goods_cat = form.goods_cat.join(',');

          //处理动态参数
          this.manyTableData.forEach(item => {
            const newInfo = {
              attr_id: item.attr_id,
              attr_value: item.attr_vals.join(',')
            };
            this.addForm.attrs.push(newInfo);
          })

          //处理静态属性
          this.onlyTableData.forEach(item => {
            const newInfo = {
              attr_id: item.attr_id,
              attr_value: item.attr_vals
            };
            this.addForm.attrs.push(newInfo);
          })
          form.attrs = this.addForm.attrs;
          console.log(form);

          //发起请求
          //商品的名称必须是唯一的
          const {data:res} = await this.$http.post('goods',form);
          if(res.meta.status !==201) {
            return this.$message.error('添加商品失败!');
          } else {
            this.$message.success('添加商品成功!');
            this.$router.push('/goods');
          }
        }
      })
    }
  },
  computed: {
    cateId() {
      if (this.addForm.goods_cat.length === 3) {
        return this.addForm.goods_cat[2];
      } else {
        return null;
      }
    },
  },
};
</script>

<style scoped>
.el-checkbox {
  margin: 0 10px 0 0 !important;
}
.previewImg {
  width:100%;
}
.addBtn {
  margin-top: 15px;
}
</style>